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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8eef9899a17be3147751af87de16811652013c137ca341b05f8dfa90a7d444b' 
  AND token = 'ihhuDDDKhuRs9nEHCM2Bv1VpA40w73HJp1wNMdJKEk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}